Sweden is investigating damage to a data cable linked to Latvia, the latest breach in the Baltic Sea region where European authorities are on high alert.

The Swedish coast guard seized a Bulgarian ship after a fibre-optic cable under the Baltic Sea linking Sweden to Latvia was damaged, officials said on Monday. The damage to the cable occurred in Swedish territorial waters at a depth of at least 50 metres (164 feet),

Latvian navy coordinating with Nato over incident which comes after military alliance boosted its presence in Baltic Sea in December